修复发布页移动端小数输入与押金下限校验

- 哈夫币/M：移动端输入框由 type="digit" 改为 type="number"，
  与绝密KD 一致，iOS 可输入小数点（烽火等级保持取整不变）
- 押金：新增 handleDepositBlur，输入框失焦时若低于智能推荐额度
  （或为空/非法）自动补足到推荐值并提示，桌面与移动端均生效；
  提交时校验保留作兜底

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/features/seller/composables/usePublishForm.ts

@@ -612,6 +612,17 @@ export function usePublishForm(options: UsePublishFormOptions) {
     }
   }
 
+  // 失焦时实时校正：押金低于（或低于等于无效/为空）智能推荐时自动补到推荐值并提示。
+  function handleDepositBlur() {
+    const recommended = pricing.recommendedDepositAmount.value
+    if (recommended <= 0) return
+    const current = Number(form.depositAmountYuan)
+    if (form.depositAmountYuan === '' || !Number.isFinite(current) || current < recommended) {
+      form.depositAmountYuan = recommended
+      options.notifyWarning(`押金不能低于智能推荐 ¥${recommended}，已自动调整`)
+    }
+  }
+
   function clearForbiddenQuantityItems() {
     for (const item of pricing.quantityItems.value) {
       if (!pricing.isQuantityItemDisabled(item)) continue
@@ -959,6 +970,7 @@ export function usePublishForm(options: UsePublishFormOptions) {
     handleAcceleratedSaleRatioInput,
     syncRecommendedDeposit,
     useRecommendedDeposit,
+    handleDepositBlur,
     clearForbiddenQuantityItems,
     setQuantityMode,
     clampAcceleratedSaleRatioInput,